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BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text
Significance
Criteria
Table 9.1 Assessment of Impacts
Description of Criteria Example of Criteria
Major adverse The development has a high probability of
flooding.
The proposal will have severe detrimental
effects upon local watercourses estuary.
Moderate
adverse
The development has a medium probability
of flooding.
The proposal may result in moderate
detrimental effects upon local
watercourse/estuary.
Minor adverse The development has a low probability of
flooding.
The proposal may result in temporary and
minor detrimental effects to local
watercourses estuary.
Negligible The proposal results in no appreciable impact
on watercourses estuary.
Minor beneficial The proposals may result in minor reduction
in flood risk.
Moderate
beneficial
The proposals may result in moderate
reduction in flood risk.
Permanent flooding or
change to flow
characteristics of
watercourses.
Severe temporary flooding or
change to flow
characteristics of
watercourses.
Moderate localised flooding.
Any minor effects are
reversible.
Minor reduction in flood risk.
Moderate reduction in flood
risk.
Major beneficial Major reduction in flood risk. Moderate to significant
localised/regionalised
reduction in flood risk.
9.19 In applying the above impact assessment, if a major moderate adverse impact is identified,
mitigation measures will be developed to reduce or mitigate that impact. It is likely that any major
impacts would be a material consideration in the decision making process for the development.
However, minor or negligible significance of impacts are unlikely to represent a constraint on the
development.
9.20 The impact of flood risk on the proposed development has been undertaken primarily through the
assessment of breach and overtopping Flood Hazard Ratings provided by the EA for the site. The
methodology used to assess the impact of the development on flood risk is described in more
detail in the impact assessment sections.
Baseline Description
Introduction
9.21 This section outlines the baseline conditions for the site in terms of the tidal environment; the
fluvial environment; the groundwater environment; coastal defences and tidal flooding; fluvial
flooding and drainage. A detailed FRA has been provided in Annex 9 and this should be referred
to alongside this Chapter.
5100935.404 Environmental Statement August 2011 131